<template>
<div>
    <!-- 面包屑导航区域 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片试图区域 -->
        <el-card>
            <!-- 头部的警告消息 -->
            <el-alert
                title="注意 : 只允许为第三级分类设置相应的参数"
                type="warning"
                show-icon
                :closable="false">
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                   <span>选择商品分类:</span> 
                   <!-- 选择商品分类的级联选择框 
                   options指定数据源-->
                   <el-cascader
                        expand-trigger="hover "
                        v-model="selectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini"
                    :disabled="isBtnDisabled" @click="addDialogVisible='true'">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border  stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                                closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <!-- button显示     -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>     
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit"
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini"
                    :disabled="isBtnDisabled" @click="addDialogVisible='true'">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border  stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                                closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <!-- button显示     -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>     
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit"
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed"
            >
            <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed"
            >
            <!-- 修改参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
</div>      
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
               attr_name:'' 
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
                ]
            },
            // 修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单验证规则对象
            editFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
                ]
            },
            // // 控制按钮与文本框的显示
            // inputVisible:false,
            // // 文本框输入的内容
            // inputValue:'',
        }
    },
    created(){
        this.getCateList()

    },
    methods:{
        // 获取商品分类列表
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error("获取商品分类列表失败");
            }
            this.cateList=res.data
            console.log(this.cateList);
        },
        // 级联选择框选中项发生变化,会出发这个函数
        async handleChange(){
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleClick(){    
            this.getParamsData()
            console.log(this.activeName);
        },
        // 获取参数的列表数据
        async getParamsData(){
            // console.log(this.selectedCateKeys);
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return 
            }
            console.log(this.selectedCateKeys);
            // 根据所选分类的Id,和当前所处的面板,获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error("获取参数列表失败")
            }
            console.log(res.data)
            res.data.forEach(item => {
              item.attr_vals=item.attr_vals?item.attr_vals.split(','):[]
              //控制文本框的显示与隐藏
              item.inputVisible=false
            //   文本框中输入的值
              item.inputValue=''
            })
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        // 监听添加参数对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮,添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        // 点击按钮,展示修改对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数信息失败')
            }
            this.editForm=res.data

            this.editDialogVisible=true
            },
        // 重置修改的表单
        editDialogClosed(){
            this.$ref.editFormRef.resetFields()
        },
        // 点击按钮,修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,
                attr_sel:this.activeName})
                if(res.meta.status!==200){
                    return this.$message.error('修改参数失败!')
                }
                this.$message.success('修改参数成功!')
                this.getParamsData()
                this.editDialogVisible=false

            })
        },
        // 点击按钮,删除参数信息
        async removeParams(attr_id){
            const confirmResult=await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err=>err)

            // 用户取消了删除的操作
            if(confirmResult!=='confirm'){
                return this.$message.info('已取消了删除')
            }
            // 删除的业务逻辑
            const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!==200){
                return this.$message.error('删除参数失败')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        // 文本框失去了焦点或者摁下了enter键都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            // 如果没有return，则证明输入了内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            // 需要发起请求，保存这次的操作
            this.saveAttrVals(row) 
        },
        // 将对attr-vals的值保存到数据库
        async saveAttrVals(row){
            const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(',')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败')
            }
           this.$message.success('修改参数项成功') 

        },
        // 点击按钮,展示文本输入框
        showInput(row){
            row.inputVisible=true
            // 让文本框自动获得焦点
            // $nextTick方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除Tag标签删除对应参数的可选项
        async handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
        
    },
    computed:{
        // 如果按钮需要被禁用,组返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
             return false
        },
        // 当前选中的分类id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        },
        
    }
}
</script>

<style  lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 15px;
}
.el-input{
    width: 120px;
}

</style>